P91鋼蠕變-疲勞交互作用損傷模型研究及壽命評估.pdf

1、西南交通大學(xué)碩士學(xué)位論文P91鋼蠕變疲勞交互作用損傷模型研究及壽命評估姓名：魏峰申請學(xué)位級別：碩士專業(yè)：固體力學(xué)指導(dǎo)教師：戴振羽20081101西南交通大學(xué)碩士研究生學(xué)位論文第1I頁AbstractWiththerapiddevelopmentofmodemindustrytheimpactofcreep／fatigue紐dtheirinteractiononthematerialmustbetakenintoconsideration

2、inordertoCNSUrCthesafetyandreliabilityofequipmentswhichoperateunderhightemperatureconditionsThus，thepredictionofmateriallifeundercreep／fatigueandtheirinteractionisofgreatimportancetothedesign，selectkmandsafetyevaluationo

3、fhightemperatureresistantcomponentsThispaperanalyzesandresearchesthetestresultsofthecreep／fatigueandtheirinteraction，usingP91steel，andfindsoutthatthefatiguelifeincreasedwhilethecreeplifedecreasedunderthecreep／fatigueinte

4、ractionItisconcluded，therefore，thatthecreepdamageandfatiguedamagedonotnecessarilyenhanceandaccelerateeachotherundertheinteractionTheymayinhibiteachotheraswellWithmesodamagemechanicsanalysis，itisdiscoveredthatwhenmaterial

5、isdamagedtoacertaindegree，cavitymayresultinThen，someofthecavitiesatetensiledeformedduringtheprocessofcyclicloadingwhichcausesthemicrocracksinturnInotherwords，someofthecavitiescausedbythecreepdamagealeconsumedandthentrans

6、formedintomicrocracksresultedformthefatiguedamageduringeachcyclicprocessSo，thecreepdamageisinhibitedandthecreeplifeincreaseswhilethefatiguedamageisenhancedandthefatiguelifedecreasesundertheinteractionThecreepdamageindexa

7、ndfatiguedamageindexisintroducedintothecreep／fatigueinteractiondamagemodelwhenthelineardamageaccumulationmethodandcorrectionmethodarestudiedinthispapecAlso，theinteractioninfluencequantitywhichmeanstheinfluencethatthecycl